NGK – Step-colder Spark Plugs – Iridium IX 2309




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Sold as a SET OF 4

NGK IX Iridium Series plugs were designed specifically for the performance enthusiast.

  • Fine wire center electrode ensures high durability and a consistently stable spark
  • Iridium alloy has an extremely high melting point, perfect for today’s high-tech, high performance engines
  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
  • Corrugated ribs prevent flashover
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
  • Copper core aids in heat removal
  • Triple seals prevent leakage


Spark Plug Hex Size 5/8 in.
Spark Plug Reach 26.5 mm
Spark Plug Seat Type Gasket
Spark Plug Thread Size 14 mm
UNSPSC 26101732